by Marihot P. Siahaan
$16.00

by Drs. Inu Kencana Syafiie, Djamaludin Tandjung, dan Supardan Modeong
$11.00

by Tb. Ace Hasan syadzily
$12.00

by Prof. Dr. Sondang P. Siagian, M.P.A
$7.00

by Dennis L. Poster
$9.00

by Rosalie Mengsio
$11.00